diff --git a/src/merge/output_control.cpp b/src/merge/output_control.cpp
index 1ff208384..9cae5cce1 100644
--- a/src/merge/output_control.cpp
+++ b/src/merge/output_control.cpp
@@ -730,7 +730,7 @@ relocate_written_data(uint64_t data_start_pos,
   // end and starting to write from there won't work with most of the
   // mm_io_c-derived classes.
   s_out->save_pos(s_out->get_size());
-  auto dummy_data = std::make_unique<std::string>(to_relocate, '\0');
+  auto dummy_data = std::make_unique<std::string>(delta, '\0');
   s_out->write(dummy_data->c_str(), dummy_data->length());
   s_out->restore_pos();
 
diff --git a/tests/results.txt b/tests/results.txt
index 4f1fa9fd7..fdd671a3e 100644
--- a/tests/results.txt
+++ b/tests/results.txt
@@ -352,5 +352,5 @@ T_503pcm_in_mkv_varying_samples_per_packet:81c000712108e2a604c8a30b7677606f:pass
 T_504dts_96_24_identification:1837ab5b411944e143f9dae6fe6436d8-bb7c41b5aa1b57f18741b792897b0b59-90994a65c6f828ecfead9bd6473453a2:passed:20151006-223804:2.278995107
 T_505cisco_talos_can_0036:bf0fedc494cf99a0920d7a6e69edf952-6ef415b0f84d3e5dd435244362a37584:passed:20151020-161153:0.071686357
 T_506cisco_talos_can_0037:5461288548eac976164cd13f01bc9426-ed695caee29b1456da8629d38321ec9c-92b7169fc05ddf54c46816869c108f31-54a55a6d87bd4c08269891efb03980b3-fef3d018523c7d1fbed763f6666c1ae2-ac584cc44854f9396739df6e93d78acc-b415b2ef2a6dddf5d89733446fae2970-dd53fee23372c569d35e0b2918d86239:passed:20151020-161234:0.319298931
-T_507rerender_track_headers:7b16f08b7858a1d332516a6fb25a184b-ac9514a1f09f26ac0cb2f527ec2de0b7:passed:20151022-104930:2.573204876
+T_507rerender_track_headers:7b16f08b7858a1d332516a6fb25a184b-180751296d662c5c5691f712803feecc:passed:20151022-104930:2.573204876
 T_508splitting_by_parts_with_segment_linking:existence0-true-true-true-existence1-true-true-true-existence2-true-true-true-equality_previous-true-true-equality_next-true-true:passed:20151103-204257:0.111807853